/Engine/Source/Runtime/Renderer/Public/PrimitiveSceneInfo.h
Flags needed for broad phase culling of runtime virtual texture page rendering.
struct FPrimitiveVirtualTextureFlags
uint8:  1
bRenderToVirtualTexture
True if the primitive can render to virtual texture
uint8:  Runtime...
RuntimeVirtualTextureMask
Mask of the allocated runtime virtual textures in the scene to render to.